Bonjour!
The rule about adjectives is that they follow the nouns, like la maison bleue, or le chien méchant (the bad dog). There are a set of adjectives that go before the noun - they represent ideas like beauty, age, goodness and size (BAGS)
beau (beautiful), joli (pretty),jeune (young), vieux (old), nouveau (new), bon (good), meilleur (better), mauvais (bad), gentil (kind), petit (small), haut (high), gros (fat)
there might be one or two more adjectives that fit into the BAGS category - just remember, keep your BAGS in front!